* {
	margin: 0;
	padding: 0;
	box-sizing: border-box;
	font-family: "Poppins", sans-serif;
}

html,
body {
	/* background-color: #000000; */
	display: grid;
	height: 100%;
	place-items: center;
	overflow: hidden;
}

.btn-4 {
	position: relative;
	display: inline-block;
	padding: 15px 30px;
	color: #2196f3;
	text-transform: uppercase;
	letter-spacing: 4px;
	text-decoration: none;
	font-size: 24px;
	overflow: hidden;
	transition: 0.2s;
}
 
.btn-4 span {
	position: absolute;
	display: block;
}

.btn-4 span:nth-child(1) {
	top: 0;
	left: -100%;
	width: 100%;
	height: 2px;
	background: linear-gradient(90deg, transparent, #2196f3);
}

.btn-4:hover span:nth-child(1) {
	left: 100%;
	transition: 1s;
}


.btn-4 span:nth-child(3) {
	bottom: 0;
	right: -100%;
	width: 100%;
	height: 2px;
	background: linear-gradient(270deg, transparent, #2196f3);
}

.btn-4:hover span:nth-child(3) {
	right: 100%;
	transition: 1s;
	transition-delay: 0.5s;
}

.btn-4 span:nth-child(2) {
	top: -100%;
	right: 0;
	width: 2px;
	height: 100%;
	background: linear-gradient(180deg, transparent, #2196f3);
}

.btn-4:hover span:nth-child(2) {
	right: 100%;
	transition: 1.5s;
	transition-delay: 0.5s;
}

.btn-4 span:nth-child(4) {
	bottom: -100%;
	left: 0;
	width: 2px;
	height: 100%;
	background: linear-gradient(360deg, transparent, #2196f3);
}

.btn-4:hover span:nth-child(4) {
	bottom: 100%;
	transition: 1s;
	transition-delay: 0.75s;
}